Airman 1st Class Mylia Simpson, 36th Security Forces Squadron entry controller, adjusts the front sight of her M4 carbine July 7, 2016, at Andersen Air Force Base, Guam. The target is used to determine how sights need to be adjusted and consists of a four quadrant grid with a target in the center. If the shots fired all land in an area other than the target, the grid system indicates the variance and in which direction to adjust rear and front sights. (U.S. Air Force photo by Airman 1st Class Jacob Skovo)